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Corrective Action Plan Page 37 Disposition of Clean Soil When the total volume of soil to be treated has been shown statistically to the requisite degree of confidence to be free of detectable traces of gasoline or its components, the soil spread over the treatment area for aeration will be graded to reduce its thickness to about 3 in or less and then the whole of the treatment area will be thoroughly rototilled to a depth of at least 6 in to blend the clean, treated material with the substrate as a beneficial, soil amendment At that point the treatment program will be complete and the area will be returned to routine agricultural use SITE RESTORATION Paving When back filling of the remedial excavation is compete, the 152 East 11th Street site will be graded, compacted and re-paved with 4 in of bituminous macadam If the concrete paving of the sidewalks has been damaged by the remediation work, the affected areas will be restored, or, as necessary, the existing sidewalk paving will be removed over the entirety of both street-side frontages of the site and new concrete paving will be laid throughout All work to restore the sidewalks will comply with the requirements of the City of Tracy Public Works Department Replacement of Groundwator-Quality Monitoring Wells, When the site has been re-paved, two groundwater quality wells will be installed on the 152 East i 1th Street property to replace existing wells NAV I and NAV 3 which will be destroyed when the remedial excavation is opened The new wells will be designated NAV 9 and NAV 10 Their proposed locations are shown on Figure 6 These locations are intended to provide for future monitoring of groundwater quality within the interior of the existing plume of groundwater affected by components of hydrocarbons However, their exact locations may be adjusted based on consideration of future construction on, or use of, the property that might be determined at the time the wells are scheduled for installation Note It is recognized that existing monitoring well NAV 4 may be damaged by the close approach of the remedial excavation to its location at the back of the sidewalk on the "F" Street frontage of the property (see Figure 6 for location) If that should occur, well NAV 4 will also be replaced The replacement monitoring wells will each be installed to a total depth of 20 ft in borings sunk using a drilling ng equipped with an Sin open-stem auger The borings will be ' logged under the direction of a licensed geotechnical engineer The well casings will be of 2m diameter PVC with 0 021n machine cut screen slots These and other details of the well construction are shown on Figure 12 While the borings for the proposed monitoring well are being drilled, the drilling equipment will be used to recover soil samples in clean brass tubes from a depth of 5 ft in